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- -- localize math functions
- local pi = math.pi
- local square = math.sqrt
- local sin = math.sin
- local cos = math.cos
- local abs = math.abs
- local min = math.min
- local max = math.max
- local atann = math.atan
- local random = math.random
- local floor = math.floor
- local atan = function(x)
- if not x or x ~= x then
- --error("atan bassed NaN")
- return 0
- else
- return atann(x)
- end
- end
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